/* $OpenBSD: diff.c,v 1.65 2015/12/29 19:04:46 gsoares Exp $ */ /* * Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F39502-99-1-0512. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/stat.h> #include <ctype.h> #include <err.h> #include <getopt.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <limits.h> #include "diff.h" #include "xmalloc.h" int lflag, Nflag, Pflag, rflag, sflag, Tflag, cflag; int diff_format, diff_context, status, ignore_file_case; int tabsize = 8; char *start, *ifdefname, *diffargs, *label[2], *ignore_pats; char *group_format = NULL; struct stat stb1, stb2; struct excludes *excludes_list; regex_t ignore_re; #define OPTIONS "0123456789aBbC:cdD:efHhI:iL:lnNPpqrS:sTtU:uwX:x:" enum { OPT_TSIZE = CHAR_MAX + 1, OPT_STRIPCR, OPT_IGN_FN_CASE, OPT_NO_IGN_FN_CASE, OPT_NORMAL, OPT_HORIZON_LINES, OPT_CHANGED_GROUP_FORMAT, }; static struct option longopts[] = { { "text", no_argument, 0, 'a' }, { "ignore-space-change", no_argument, 0, 'b' }, { "context", optional_argument, 0, 'C' }, { "ifdef", required_argument, 0, 'D' }, { "minimal", no_argument, 0, 'd' }, { "ed", no_argument, 0, 'e' }, { "forward-ed", no_argument, 0, 'f' }, { "speed-large-files", no_argument, NULL, 'H' }, { "ignore-blank-lines", no_argument, 0, 'B' }, { "ignore-matching-lines", required_argument, 0, 'I' }, { "ignore-case", no_argument, 0, 'i' }, { "paginate", no_argument, NULL, 'l' }, { "label", required_argument, 0, 'L' }, { "new-file", no_argument, 0, 'N' }, { "rcs", no_argument, 0, 'n' }, { "unidirectional-new-file", no_argument, 0, 'P' }, { "show-c-function", no_argument, 0, 'p' }, { "brief", no_argument, 0, 'q' }, { "recursive", no_argument, 0, 'r' }, { "report-identical-files", no_argument, 0, 's' }, { "starting-file", required_argument, 0, 'S' }, { "expand-tabs", no_argument, 0, 't' }, { "initial-tab", no_argument, 0, 'T' }, { "unified", optional_argument, 0, 'U' }, { "ignore-all-space", no_argument, 0, 'w' }, { "exclude", required_argument, 0, 'x' }, { "exclude-from", required_argument, 0, 'X' }, { "ignore-file-name-case", no_argument, NULL, OPT_IGN_FN_CASE }, { "horizon-lines", required_argument, NULL, OPT_HORIZON_LINES }, { "no-ignore-file-name-case", no_argument, NULL, OPT_NO_IGN_FN_CASE }, { "normal", no_argument, NULL, OPT_NORMAL }, { "strip-trailing-cr", no_argument, NULL, OPT_STRIPCR }, { "tabsize", optional_argument, NULL, OPT_TSIZE }, { "changed-group-format", required_argument, NULL, OPT_CHANGED_GROUP_FORMAT}, { NULL, 0, 0, '\0'} }; void usage(void) __dead2; void push_excludes(char *); void push_ignore_pats(char *); void read_excludes_file(char *file); void set_argstr(char **, char **); int main(int argc, char **argv) { const char *errstr = NULL; char *ep, **oargv; long l; int ch, dflags, lastch, gotstdin, prevoptind, newarg; oargv = argv; gotstdin = 0; dflags = 0; lastch = '\0'; prevoptind = 1; newarg = 1; diff_context = 3; diff_format = 0; while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) { switch (ch) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': if (newarg) usage(); /* disallow -[0-9]+ */ else if (lastch == 'c' || lastch == 'u') diff_context = 0; else if (!isdigit(lastch) || diff_context > INT_MAX / 10) usage(); diff_context = (diff_context * 10) + (ch - '0'); break; case 'a': dflags |= D_FORCEASCII; break; case 'b': dflags |= D_FOLDBLANKS; break; case 'C': case 'c': cflag = 1; diff_format = D_CONTEXT; if (optarg != NULL) { l = strtol(optarg, &ep, 10); if (*ep != '\0' || l < 0 || l >= INT_MAX) usage(); diff_context = (int)l; } break; case 'd': dflags |= D_MINIMAL; break; case 'D': diff_format = D_IFDEF; ifdefname = optarg; break; case 'e': diff_format = D_EDIT; break; case 'f': diff_format = D_REVERSE; break; case 'H': /* ignore but needed for compatibility with GNU diff */ break; case 'h': /* silently ignore for backwards compatibility */ break; case 'B': dflags |= D_SKIPBLANKLINES; break; case 'I': push_ignore_pats(optarg); break; case 'i': dflags |= D_IGNORECASE; break; case 'L': if (label[0] == NULL) label[0] = optarg; else if (label[1] == NULL) label[1] = optarg; else usage(); break; case 'l': lflag = 1; break; case 'N': Nflag = 1; break; case 'n': diff_format = D_NREVERSE; break; case 'p': if (diff_format == 0) diff_format = D_CONTEXT; dflags |= D_PROTOTYPE; break; case 'P': Pflag = 1; break; case 'r': rflag = 1; break; case 'q': diff_format = D_BRIEF; break; case 'S': start = optarg; break; case 's': sflag = 1; break; case 'T': Tflag = 1; break; case 't': dflags |= D_EXPANDTABS; break; case 'U': case 'u': diff_format = D_UNIFIED; if (optarg != NULL) { l = strtol(optarg, &ep, 10); if (*ep != '\0' || l < 0 || l >= INT_MAX) usage(); diff_context = (int)l; } break; case 'w': dflags |= D_IGNOREBLANKS; break; case 'X': read_excludes_file(optarg); break; case 'x': push_excludes(optarg); break; case OPT_CHANGED_GROUP_FORMAT: diff_format = D_GFORMAT; group_format = optarg; break; case OPT_HORIZON_LINES: break; /* XXX TODO for compatibility with GNU diff3 */ case OPT_IGN_FN_CASE: ignore_file_case = 1; break; case OPT_NO_IGN_FN_CASE: ignore_file_case = 0; break; case OPT_NORMAL: diff_format = D_NORMAL; break; case OPT_TSIZE: tabsize = (int) strtonum(optarg, 1, INT_MAX, &errstr); if (errstr) { warnx("Invalid argument for tabsize"); usage(); } break; case OPT_STRIPCR: dflags |= D_STRIPCR; break; default: usage(); break; } lastch = ch; newarg = optind != prevoptind; prevoptind = optind; } argc -= optind; argv += optind; #ifdef __OpenBSD__ if (pledge("stdio rpath tmppath", NULL) == -1) err(2, "pledge"); #endif /* * Do sanity checks, fill in stb1 and stb2 and call the appropriate * driver routine. Both drivers use the contents of stb1 and stb2. */ if (argc != 2) usage(); if (ignore_pats != NULL) { char buf[BUFSIZ]; int error; if ((error = regcomp(&ignore_re, ignore_pats, REG_NEWLINE | REG_EXTENDED)) != 0) { regerror(error, &ignore_re, buf, sizeof(buf)); if (*ignore_pats != '\0') errx(2, "%s: %s", ignore_pats, buf); else errx(2, "%s", buf); } } if (strcmp(argv[0], "-") == 0) { fstat(STDIN_FILENO, &stb1); gotstdin = 1; } else if (stat(argv[0], &stb1) != 0) err(2, "%s", argv[0]); if (strcmp(argv[1], "-") == 0) { fstat(STDIN_FILENO, &stb2); gotstdin = 1; } else if (stat(argv[1], &stb2) != 0) err(2, "%s", argv[1]); if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode))) errx(2, "can't compare - to a directory"); set_argstr(oargv, argv); if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { if (diff_format == D_IFDEF) errx(2, "-D option not supported with directories"); diffdir(argv[0], argv[1], dflags); } else { if (S_ISDIR(stb1.st_mode)) { argv[0] = splice(argv[0], argv[1]); if (stat(argv[0], &stb1) < 0) err(2, "%s", argv[0]); } if (S_ISDIR(stb2.st_mode)) { argv[1] = splice(argv[1], argv[0]); if (stat(argv[1], &stb2) < 0) err(2, "%s", argv[1]); } print_status(diffreg(argv[0], argv[1], dflags, 1), argv[0], argv[1], ""); } exit(status); } void set_argstr(char **av, char **ave) { size_t argsize; char **ap; argsize = 4 + *ave - *av + 1; diffargs = xmalloc(argsize); strlcpy(diffargs, "diff", argsize); for (ap = av + 1; ap < ave; ap++) { if (strcmp(*ap, "--") != 0) { strlcat(diffargs, " ", argsize); strlcat(diffargs, *ap, argsize); } } } /* * Read in an excludes file and push each line. */ void read_excludes_file(char *file) { FILE *fp; char *buf, *pattern; size_t len; if (strcmp(file, "-") == 0) fp = stdin; else if ((fp = fopen(file, "r")) == NULL) err(2, "%s", file); while ((buf = fgetln(fp, &len)) != NULL) { if (buf[len - 1] == '\n') len--; if ((pattern = strndup(buf, len)) == NULL) err(2, "xstrndup"); push_excludes(pattern); } if (strcmp(file, "-") != 0) fclose(fp); } /* * Push a pattern onto the excludes list. */ void push_excludes(char *pattern) { struct excludes *entry; entry = xmalloc(sizeof(*entry)); entry->pattern = pattern; entry->next = excludes_list; excludes_list = entry; } void push_ignore_pats(char *pattern) { size_t len; if (ignore_pats == NULL) ignore_pats = xstrdup(pattern); else { /* old + "|" + new + NUL */ len = strlen(ignore_pats) + strlen(pattern) + 2; ignore_pats = xreallocarray(ignore_pats, 1, len); strlcat(ignore_pats, "|", len); strlcat(ignore_pats, pattern, len); } } void print_only(const char *path, size_t dirlen, const char *entry) { if (dirlen > 1) dirlen--; printf("Only in %.*s: %s\n", (int)dirlen, path, entry); } void print_status(int val, char *path1, char *path2, const char *entry) { switch (val) { case D_BINARY: printf("Binary files %s%s and %s%s differ\n", path1, entry, path2, entry); break; case D_DIFFER: if (diff_format == D_BRIEF) printf("Files %s%s and %s%s differ\n", path1, entry, path2, entry); break; case D_SAME: if (sflag) printf("Files %s%s and %s%s are identical\n", path1, entry, path2, entry); break; case D_MISMATCH1: printf("File %s%s is a directory while file %s%s is a regular file\n", path1, entry, path2, entry); break; case D_MISMATCH2: printf("File %s%s is a regular file while file %s%s is a directory\n", path1, entry, path2, entry); break; case D_SKIPPED1: printf("File %s%s is not a regular file or directory and was skipped\n", path1, entry); break; case D_SKIPPED2: printf("File %s%s is not a regular file or directory and was skipped\n", path2, entry); break; } } void usage(void) { (void)fprintf(stderr, "usage: diff [-aBbdilpTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n" " [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]\n" " [-I pattern] [-L label] file1 file2\n" " diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]\n" " [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]\n" " -C number file1 file2\n" " diff [-aBbdiltw] [-I pattern] [--ignore-case] [--no-ignore-case]\n" " [--normal] [--strip-trailing-cr] [--tabsize] -D string file1 file2\n" " diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]\n" " [--no-ignore-case] [--normal] [--tabsize] [--strip-trailing-cr]\n" " -U number file1 file2\n" " diff [-aBbdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n" " [--no-ignore-case] [--normal] [--tabsize] [-I pattern] [-L label]\n" " [-S name] [-X file] [-x pattern] dir1 dir2\n"); exit(2); }